3, download PDF then take a look( normally 100% size to preview) make sure the font,color, resolution is acceptable,

if yes, upload the PDF file when you order then we print directly. This can save your approval time.

If you design your poster with Adobe series programs, Please use CMYK color mode, at original size with 300 dpi resolution. you also need Merge all Layers in one before save final file.

If you design your poster with Microsoft series,Please check PDF carefully after coverted. such as format, color, etc. also, please note RGB color system is different with CMYK color system. try to use soild color. complicated color might cause color issue when the RGB color is converted into CMYK color. please click this ariticle to get more knowlage.